The hub model
The hub is the model that has traditionally been used with CICS® dynamic transaction routing.
A routing program running in a TOR routes transactions between
several AORs. Usually, the AORs (unless they are AOR/TORs) do no dynamic
routing. Figure 1 shows a hub routing
model.
The hub model applies to the routing of:
- Transactions started from terminals.
- Transactions started by terminal-related START commands.
- Program-link requests received from outside CICS. (The receiving region acts as a hub or TOR because it routes the requests among a set of back-end server regions.)
- Bridge 3270 requests.
The hub model is a hierarchical system; routing is controlled by one region (the TOR). Normally a routing program runs only in the TOR.